Antepartum (20%)
Terminology & GTPAL nomenclature
Key Terms:
Gravida = Pregnant
Para = Birth
Nulligravida/Nullipara = Never given birth
Primigravida/primipara = First pregnancy/birth
Multigravida/multipara = Woman has given birth multiple times
Antepartum = Before labor
GTPAL
o G = Number of pregnancies
o T = Number of term births (37 weeks or greater)
o P = Preterm births (Less than 37)
o A = Number of abortions (TAB) or miscarriages (SAB)
o L = Number of living children
G/P
o Number of pregnancies/ Number of births
Diagnosis of pregnancy & signs: presumptive, probable & positive
o Presumptive- changes felt by woman (vomiting, tender breasts, cravings, no period,
frequent urination, enlarging uterus, syncope, nausea, fatigue)
o Probable-changes observed by examiner (pregnancy HCG test, braxton hicks
contractions, chadwick sign, hegar sign, goodell sign, ballottement sign)
o Positive-signs attributable ONLY to the presence of a fetus (ultrasound, fetal heart
tones)
Nutrition during pregnancy & sources of nutrients: iron, carbs, protein, calcium
Iron Maternal hemoglobin formation
Liver, meats, whole grain or enriched
breads and cereals, dark green leafy
vegetables, legumes, dried fruits
Carbs Primary source of energy
Whole (fruits, vegetables, whole food
grains) instead of processed food
Protein Growth of maternal tissue and
expansion of blood volume; Secretion
of milk protein during lactation
Meats, eggs, cheese, yogurt, legumes,
nuts, grains
Calcium Maintenance of maternal bone and
tooth mineralization
Milk, cheese, yogurt, sardines or other
fish eaten with bones in, dark green
, leafy vegetables except spinach or
swiss chard, calcium-set tofu, baked
beans, tortillas
Hormonal influences during pregnancy
Hormone Source Effects of changes during
pregnancy
hCG Fertilized ovum and chorionic villi Maintains corpus luteum
production of estrogen and
progesterone until the placenta
takes over the function
Progesterone Corpus luteum until 6-10 weeks of Suppresses secretion of FSH and LH
gestation, then the placenta by the anterior pituitary; Maintains
pregnancy by relaxing smooth
muscles, decreasing uterine
contractility; causes fat to deposit
in subcutaneous tissue over the
maternal abdomen, back, and
upper thighs; decreases mothers
ability to use insulin
Estrogen Corpus luteum until 6-10 weeks of Suppresses secretion of FSH and LH
gestation, then the placenta by the anterior pituitary gland;
causes fat to deposit in
subcutaneous tissues over the
maternal abdomen, back, and
upper thighs; promotes
enlargement of genitals, uterus,
and breasts; increases vascularity;
relaxes pelvic ligaments and joints;
interferes with folic acid
metabolism; increases the level of
total body proteins; promotes
retention of sodium and water;
decreases secretion of hydrochloric
acid and pepsin; decreases
mother’s ability to use insulin
Serum prolactin Anterior pituitary gland Prepares breasts for lactation
Oxytocin Posterior pituitary gland Stimulates uterine contractions;
stimulates milk ejection from
breasts after birth
Human chorionic Placenta Acts as a growth hormone;
somatomammotropin Contributes to breast
development; decreases maternal
metabolism of glucose; increases
the amount of fatty acids for
metabolic needs
T3 and T4 Thyroid gland Increase in thyroid hormones
supports maternal metabolism and
fetal growth and development
Parathyroid Parathyroid glands Controls calcium and magnesium
metabolism
, Insulin Pancreas Increases production of insulin to
compensate for insulin antagonism
caused by placental hormones;
effect of insulin antagonist is to
decrease tissue sensitivity to insulin
or ability to use insulin
Cortisol Adrenal glands Stimulates production of insulin;
increases peripheral resistance to
insulin
Aldosterone Adrenal glands Stimulates reabsorption of excess
sodium from the renal tubules
Fundal height progression
The expectation is that after week 24 of pregnancy the fundal height for a normally growing baby will
match the number of weeks of pregnancy — plus or minus 2 centimeters. For example, if you're 27
weeks pregnant, your health care provider would expect your fundal height to be about 27 centimeters.
EDD calculation: Nagele’s rule
o Nagele’s rule
o Determine first day of LMP (last menstrual period), subtract 3 months, add 7
days plus 1 year
o Alternatively, add 7 days to LMP and count forward 9 months
o Most women give birth from 7 days before to 7 days after due date
A&P of pregnancy-structure and functions
Pregnancy:
Spans 9 months
o 10 lunar months of 28 days (280 days total)
Trimesters
o First: week 1 through 13
o Second: weeks 14 through 26
o Third: weeks 27 through 40
Total term pregnancy = 37-42 weeks
Diagnosis of Pregnancy:
Early detector: HCG-Human chorionic gonadotropin
o Detect as early as 7 days after conception
o Gradually increases and peaks at 60-70 days then remains stable until 30 weeks
o Detect in serum and urine (first morning void is best)
o ELISA technology is how most home pregnancy tests work
Diagnostic testing during pregnancy: NST, CST, BPP, GBS, Glucose tolerance test
Nonstress test (fetal activity determination)
o reactive NST
, at least 2 15-bpm FHR accelerations lasting 15 seconds or more with fetal
movements over 20 minutes (over 32 weeks gestation)
o nonreactive NST
reactive criteria not demonstrated or met
o unsatisfactory NST
inadequate external monitor tracing of FHR
Vibroacoustic stimulation
o Variability with sound/vibration applied to abdomen
Contraction stress test (CST)
o Evaluate fetal response to stress
o Have to be having contractions and ready for labor
Nipple stimulation (releases oxytocin)
Give oxytocin via IV (so you can stop the infusion at any time)
o A (-) contraction stress test is what we want to see
o Indicated for pregnancies at risk for placental insufficiency or fetal compromise as a
result of
IUGR
diabetes mellitus
Post term or 42 week’s gestation or more
nonreactive NST
abnormal or suspicious BPP
Biophysical Profile:
Assess fetus at risk for intrauterine compromise
Used to assess fetal wellbeing
Assessment of 5 fetal variables
o breathing movement (the lungs are practicing by taking fluid in & out of the lungs)
o body movement
o Tone
o amniotic fluid volume
o FHR reactivity-non stress testing
Indications for testing
o decreased fetal movement with subsequent non-reactive NST
o management of IUGR
o preterm, diabetic, and post term pregnancies
o PROM-early dx of fetal infection
Group B Streptococcus (GBS):
Common normal flora of GI tract
o 1 in 4 women have GBS in the vagina
Leading cause of infection in the newborn
o Respiratory (most frequent), meningitis, sepsis
o Prematurity increases this risk
Testing routinely done between 35-37 weeks
o Vaginal swab, 3 day culture
o Results valid for 5 weeks
o Rapid test available for unknown status in labor, 75 minutes
Prophylactic antibiotics: 4 hours prior to delivery (to decrease bacteria in the vaginal tract)